Millikelvin measurements of permittivity and loss tangent of lithium niobate
Silvia Zorzetti, Changqing Wang, I. Gonin, С. В. Казаков, T. Khabiboulline, Alexander Romanenko, Vyacheslav Yakovlev, Anna Grassellino
Abstract
Lithium niobate is an electro-optic material with many applications in microwave and optical signal processing, communication, quantum sensing, and quantum computing. In this Letter, we present findings on evaluating the complex electromagnetic permittivity of lithium niobate at millikelvin temperatures. Measurements are carried out using a resonant-type method with a superconducting radio-frequency cavity operating at 7 GHz and designed to characterize anisotropic dielectrics. The relative permittivity tensor and loss tangent are measured at 50 mK with unprecedented accuracy.
Topics & Concepts
PermittivityDissipation factorTangentLithium niobateMaterials scienceDielectric permittivityDielectricPhysicsOpticsOptoelectronicsMathematicsGeometryMicrowave Dielectric Ceramics SynthesisPhotorefractive and Nonlinear OpticsAcoustic Wave Resonator Technologies